At midnight, President Barack Obama administration's Office of Management and Budget ordered federal agencies to 'execute plans for an orderly shutdown due to the absence of appropriations.' This is the first time in 17 years the U.S government has lost their funding while sending out a mandatory shutdown.

According to the NY DailyNews:

The shutdown would keep 800,000 federal workers at home on Tuesday and inconvenience millions of people who rely on federal services or are drawn to the nation’s parks and other attractions. Critical workers, from the Border Patrol to air-traffic controllers, would remain on the job, unpaid.

Despite the drama, members of Congress faced no threat to their own pay, because the 27th Amendment to the Constitution bars their salaries from being subjected to the annual appropriations process. Obama, too, will still be paid. 

Conservative firebrand Sen. Ted Cruz (R-Tex.), who made himself the face of the GOP effort to block Obamacare through the funding bill, pledged Monday to donate his salary to charity during the shutdown. 

Repeatedly Monday, amid all the political posturing and rhetoric, the House amended a Senate resolution to fund the government to add a one-year delay in Obamacare, and other alterations. Repeatedly the Senate rejected those conservative-backed changes.

The Senate then sent the House a so-called “clean” bill — one that would simply keep government running through Nov. 15. With the ball back in their court, House Republicans sought different concessions in exchange for keeping the government funded. They called for a one-year delay in the Obamacare requirement for individuals to buy coverage. 

They also sought to force members of Congress and their aides, as well as Obama, Vice President Biden and Obama’s political appointees, to bear the full cost of their own coverage by barring the government from making the customary employer contribution. “This is a matter of funding the government and providing fairness to the American people,” said Boehner. “Why wouldn’t members of Congress vote for it?” 

The bill passed, 228 to 201.

Unimpressed, Senate Democrats greeted it as dead on arrival in their chamber. 

For the first time since the showdown began, there were fissures in the Republican strategy that has been carried out at the insistence of conservatives aligned with the Tea Party. Twelve lawmakers sided with Democrats in a late Monday vote on adding an Obamacare delay to a spending bill, a minor revolt by moderate-leaning Republicans.